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OpenAI's flagship multimodal reasoning model, released in 2026. GPT-5 (and its GPT-5.2 update) introduced a tiered reasoning system — Instant, Thinking, and Pro modes — letting users trade latency for depth. The Pro tier scored a perfect 100% on the AIME 2025 benchmark. GPT-5 natively handles text, images, audio, and code, and powers the new OpenAI Agents SDK for building autonomous AI workflows.